Drilling-machine.



S. L. LONG.

DRILLING MACHINE.

APPLEATION TILED JUNE 7, 1909.

Patented July 9, 1912.

2 SHEETS-SHEET 1.

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S. L. LONG.

DRILLING MACHINE. APPLICATION FILED JUNE 7, 1909. 1,031,945, PatentedJuly 9, 1912.

2 SHEEN-515E512.

uurra airs SIDNEY L. LONG, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OFONE-HALF TO GEORGE E. YOUNG AND FRED B. ATWOOD, BOTH OE MINNEAPOLIS,MINNESOTA.

DRILLING-MACHINE.

Specification of Letters Patent.

Patented J 11159, 1912.

Application filed June 7, 1909. Serial No. 500,792;

T (6% whom it may concern Be it known that I, SIDNEY L. LONG, a citizenof the United States, residing at Minneapolis, in the county of Hennepinand State of Minnesota, have invented certain new and usefulImprovements in Drilling- Machines, of which the following is aspecification.

My present invention has for its object to provide an improved boringmachine adapt-ed for general use, but especially designed andparticularly adapted for use in boring holes through stacks of papersheets or leaves, through stacks of cloth, leather or like substanceswhich can be bored only when firmly clamped and held together. A boringmachine of this type is extremely well adapted for use in boring holesin the leaves of loose leaf ledgers and the like, wherein it isdesirable to bore very smooth holes to a considerable depth, through avery large number of such leaves held tightly together, and for boringholes in books that are to be hung up.

The improved boring machine is illustrated by the accompanying drawingswherein like characters indicate like parts throughout the severalviews.

Referring to the drawings; Figure 1 is a view in side elevation, showingthe improved boring machine, some parts being broken away. Fig. 2 is adetail view in plan, showing the combined drill guide and upper die,some parts being broken away. Fig. 3 is a section taken on the line 00 mof Fig. 2. Fig. 4 is a front elevation of the boring machine, some partsbeing broken away. Fig. v

5 is a front elevation in detail of work clamping and supportingplunger, a portion of the work table and means for vertically movingsaid plunger; and Fig. 6 is a plan view of the work table and adjustablegage strips applied thereon. Fig. 7 is a plan view of work table 7.

The numeral 1 indicates a bed plate shown as supported by legs 2. Arelatively low plunger guide 3 and a relatively high bearing pedestal 4are rigidly secured at their lower portions to the bed plate 1. Atubular plunger 5 is mounted to move vertically through the plungerguide 3, and its extreme upper end (see Fig. 5) is provided with aclamping die or bushing 6. A flat metal work-table 7 is rigidly securedto a flan ed hub 8, that is telescoped on the upper emf of the plunger 5and is secured thereto, with freedom for vertical adjustments, by a setscrew 9. The bushing or clamping die 6, by adjustments of the hub 8, isadapted to be projected more or less above the table 7, and it may behere stated that the thicker the stack of paper to be bored, the greatershould be the projection of the said die above the said table.

The table supporting plunger 5 is provided with rack teeth 10 that arein mesh with the pinion 11 on a short horizontal shaft 12, which shaftis mounted in suitable bearings on the plunger guide 3 and is providedwith a head 13 having radial circunr ferentially spaced perforations 14,in one or the other of which the inner end of an arm 15 is seated. Thefree end of the arm 15 is connected at one end to the leg struc ture 22.Preferably, the rod 16 is made of two sections that are overlapped andadjustably connected, as shown, by short nutted bolts 18 and a coiledspring 19 anchored to the bed plate 1 and connected to the rod 16 andyieldingly holding the arm 15 and the foot lever 17 in their uppermostpositions. The plunger guide 3 is provided with a heavy, approximatelyU-shaped arm 20, that extends radially outward from the upper port-ionthereof, thence upward and thence radially .inward to a point above thedie or bushing 6. A die or bushing 21 is set into the upper inner-endextremity of the arm 20 and is held in axial alinement with the lowerdie or bushing 6.

The holes of the dies 6 and 21 are of the same diameter and adapted toclosely fit a drill 22. This drill 22, as shown, is an ordinary twistdrill and is detachably held in a chuck 23 of a spindle 24 that ismounted for rotary and vertical endwise movements in arms formed on theupper end of the pedestal 4. The spindle 24 is adapted to be raised andlowered by a lever 25 and is adapted to be driven by a belt, not shown,but which will run over a pulley 26 on the spindle 24 and over guidewheels 27 and 28 on the pedestal 4.

The numeral 29 indicates a pulley fixed to the pulley 28, and thenumeral 30 indicates a loose pulley mounted on the same shaft as saidpulleys 28 and 29. The said parts 24 to 30, inclusive, are of standarddr1ll press construction, and hence, are herein but briefly described.

It is, of course, understood that by move ments of the lever 25, thedrill 22 may be moved downward through the upper die 21, through thepaper or material clamped between the dies 6 and 21,'through the lowerdie 6 and onto the tubular plunger 5.

For properly holding the leaves on the work table 7, a multiplicity ofgage strips 31, as shown of angle arm form, are adjustably secured tothe said table, as shown, by short nutted bolts 32 that work in slots 83and the said table.

As is evident, the stack of sheets or mate rial to be bored, whenproperly placed upon the working table 7, on top of the lower die 6, maybe tightly compressed and clamped together, and between the dies 6 and21, by the operator stepping upon the foot lever or treadle 17. Whilethe material is thus tightly packed and held, a smooth hole may be boredtherethrough by the drill, which is forced downward, as alreadyindicated, by manipulation of the lever 25. The upper die 21 serves as aguide for the drill, and directs the same on a straight line through thework and onto the alined lower die 6. To produce the compression of thematerial required to enable a true hole to be bored through the same,the greatest pressure on the leaves must be immediately adjacent to thehole bored, and, as is evident, this is produced by the projection ofthe lower die 6 above the table 7, and by the projection of the upperdie 21 below the upper portion of the arm 20. Secured to the lever 25,is a pinion 25 which meshes with the rack teeth 24 on the sleeve 24. Infact, the dies act as clamping abutments as well as guides for thedrills. The upper die constitutes the fixed or relatively stationaryabutment and drill guide, and bears a fixed relation with respect to thenormal position of the drill, that is, the drill is normally raised butvery slightly out of the same, and might, in fact, be normallypositioned with its lower end in the said upper die. This permits thedrill to be forced in its full length through the work wheneverrequired, under. the predetermined vertical movements which may be givento the drill by the lever 25. The work is raised against the said upperdie by vertical movements of the work table, and for work ofpredetermined thickness, the table should be from the shaft head 13,then rotating said shaft till the table is brought approximately to theproper adjustments, then again inserting the said arm 15 into theproperly positioned perforation 1a of the said head.

By the improved boring machine above described, holes of any desiredsize or depth can be bored through paper, leather, cloth, or any othersoft substance, with perfectly smooth sides and without tearing thematerial.

hat I claim is:

In a boring machine, the combination with a relatively fixed die supportand a die therein projecting below the same and serving as a drillguide, of a working table mounted for vertical movements below saidupper die and provided with a lower die projecting above the sameinaxial alinement with said upper die, and a rotary drill spin- Copies ofthis patent may be obtained for five cents each, by addressing theCommissioner of Patents, Washington, D. G.

